Screw device for orthodontic treatment

ABSTRACT

A screw device for orthodontic treatment is formed with a platform part that has a relatively large radial width between a head part and a screw-body part of the screw device, and a neck part that has a radial width smaller than that of head part is also formed between the platform part and the head part. Therefore, a hook ring at the end of a spring (or rubber band) used for orthodontic treatment may be directly fitted from the head part and be positioned at the neck part without worrying about being dropped off. The thickness of the platform part may prop the spring up the gingiva for keeping from friction. By screwing the screw-body part into the maxilla (or mandible) to make the platform part abutted against the maxilla (or mandible), not only may a stable screwing force be provided for securing the screw, but also does the side surface of the platform have a function of facilitating the gingiva tissue to grow, so the healed-over wound will be more even and good looking. The screw-head part of the invention may be arranged with slot for providing an accommodation for the orthodontic archwire. The screw of the invention not only may provide a hook-hanging mechanism for the spring, but also have a function for supporting the orthodontic archwire.

1. FIELD OF THE INVENTION

[0001] The invention relates to a screw device for orthodontictreatment, especially to a screw device that may be arranged in themaxilla (or mandible) and be capable of positioning the spring used fororthodontic treatment and accommodating the orthodontic archwire. Thisapplication is a continue-in-part (CIP) application of U.S. patentapplication Ser. No. 10/211,037 filing date Aug. 5, 2002 which is nowpending.

2. BACKGROUND OF THE INVENTION

[0002] As shown in FIG. 1, in a conventional orthodontic treatmentprocess, after part of the maxilla (or mandible) 10 is cut off or atooth 12 is pulled out (usually not the incisor), the tooth 12 or themaxilla (or mandible) 10 is pulled and dragged by a orthodontic archwire13 after the operation for helping the maxilla (or mandible) 10 to healover or correcting the position of the tooth 12. In order to maintainthe position of the orthodontic archwire 13 relative to the tooth 12, itis usually to apply several orthodontic brackets 14 adhered onto thetooth 12, and each orthodontic bracket 14 is arranged with slot 141 forproviding an accommodation for the orthodontic archwire 13. The widthand the depth of the slot 141 must be slightly larger than the diameterof the orthodontic archwire 13 such that, not only may the orthodonticarchwire 13 be appropriately glided along the extensive direction of theslot 141, but also may the orthodontic archwire 13 be kept from beingdropped out of the slot 141.

[0003] As known in the prior arts, in order to provide apulling-and-dragging force to the orthodontic archwire 13, a screw 20 isscrewed on a maxilla (or mandible) 10 at the adjacency of a molar 121,then a spring 15 or rubber band is further connected between the screw20 and the end of the orthodontic archwire 13 for providing anappropriate pulling-and-dragging force. Since the end of this kind ofspring 15 used specially for orthodontic treatment in current market isall arranged with a hook ring 151 so, for the connection between thespring 15 and the end of the orthodontic archwire 13, the end of theorthodontic archwire 13 just may be bent into a hook structure 131, thenit can be easy to fit the hook ring 151 of the spring 15 into the hookstructure 131 of the end of the orthodontic archwire 13, such that bothconnection is completed. Relatively, the connection between the spring15 and the screw 20 is more difficult relatively.

[0004] As shown in FIG. 2 and FIG. 3, since the screw 20 currentlyapplied for orthodontic treatment is all belonged to the common screw 20as shown in FIG. 2 and FIG. 3, so the materials used for the screw 20,orthodontic bracket 14, and orthodontic archwire 13 are usually puretitanium alloy or stainless steel, those which are harmless to the humanbody. The screw 20 is commonly comprised of two parts: the head part 21and the screw-body part 22. A general screw head groove 211 is thenarranged on the head part 21 for providing a securing operation for ascrewdriver (not shown in the figure). Usually, the dimension of thehead part 21 is the widest part along the entire screw 20. Further, thediameter of the head part 21 is usually larger than the inner diameterof the hook ring 151 of the end of the spring 15, such that it isimpossible for the spring to be hooked and hanged on the screw 20directly. Therefore, for the current prior arts, an additional ligaturewire 16 is used for tying the end of the spring 15 onto the screw-bodypart of the screw 20. However, such kind of method has caused severalshortcomings as follows:

[0005] (1) It is difficult to operate. Since the head part 21 of thescrew 20 is larger than the hook ring 151 of the spring 15, so it isimpossible for the spring to be hooked and hanged on the screw 20 but,if the diameter of the head part 21 of this prior screw 20 is designedto be smaller than the hook ring 151 of the spring 15, then it will bemuch more easier for the spring 15 to be dropped off from the screw 20to cause further inconvenience. Therefore, the prior arts that still useadditional ligature wire 16 for tying the spring 15 and the screw 20 notonly cause inconvenient in operation, but also cause difficulties for aless-experienced doctor to approach such kind of operation.

[0006] (2) It is easy for the spring 15 and the ligature wire 16 toimpinge the gingiva 11. Since the ligature wire 16 is tied on thescrew-body part 22 of the screw 20, so the ligature wire 16 and thespring 15 will be sometimes abutted against the gingiva 11 and irritateit. Not only will the user feel uncomfortable, but also may it sometimeshurt the gingiva 11 or reduce the healing-over speed of the wounds afteroperation.

[0007] (3) It is easy loosening for the screw 20. Since the screw-bodypart 22 of the screw 20 has a partial length that must be left inadvance for tying the ligature wire 16 so, when the screw 20 is beingdriven tightly, it is impossible to screw the screw-body part 22 of thescrew 20 completely into the maxilla (or mandible) 10 to make its headpart 21 abutted smoothly against the maxilla (or mandible) 10.Contrarily, the head part 21 of the screw 20 must be kept an appropriatedistance with the maxilla (or mandible) 10 for proceeding the operationof tying the ligature wire 16. In such way, the pulling-and-draggingforce between the spring 15 and the ligature wire 16 will create atorque to the head part 21 of the screw 20, so it is easy to cause thescrew 20 to loosen or even to drop off and break off.

[0008] (4) The gingiva 11 will be ugly after being healed over. Sincethe tissue of the gingiva 11 will be sometimes abutted against the screw20 to grow during the healing procedure and there is a lack ofappropriate guidance and restriction, so the surface of the gingiva 11is uneven and ugly after being healing over.

[0009] (5) It only has a single function. This kind of prior screw 20only can be applied in tying the ligature wire 16 for connecting thespring 15, neither does it have any other function, nor is it possiblefor providing an accommodation for the orthodontic archwire 13.

[0010] As known from above description, the prior arts that are used fororthodontic treatment currently still has many shortcomings to befurther improved urgently.

SUMMARY OF THE INVENTION

[0011] The main objective of the invention is to provide an improvementfor a screw device for orthodontic treatment. The invention has an easyoperation for providing the spring to be hooked and hanged directlywithout worrying about being dropped off. It is also unnecessary to useadditional ligature wire for tying the spring, so the spring may bepropped up an appropriate height to have the advantage for avoiding anygingival irritation.

[0012] Another objective of the invention is to provide a screw devicefor orthodontic treatment to be able to screw the screw-body part of thescrew completely into the maxilla (or mandible) for avoiding anylooseness and the invention may further provide a side plane for guidingthe gingiva's tissue to grow smoothly, such that the surface of thegingiva will be more beautiful after being healed over.

[0013] The further objective of the invention is to provide a screwdevice for orthodontic treatment to be able to further form a slot onthe head part of the screw for providing an accommodation for theorthodontic archwire, such that the screw of the invention not only mayprovide the spring to be hooked and hanged, but also may have thefunction for supporting the orthodontic archwire in similarity to theorthodontic bracket.

[0014] In order to achieve above-mentioned objectives, in a preferredembodiment for the screw device for orthodontic treatment according tothe invention, it is mainly to additionally arrange a platform part thathas a relatively large dimension in radial width between the screw-bodypart and the head part of the screw and a neck part is also formedbetween the platform part and the head part. The radial width of theneck part is smaller than the head part, which is further smaller thanthe inner diameter of the hook ring of the spring. Therefore, the hookring of the spring may be fitted directly into the head part and bepositioned at the neck part without worrying about being loosened off.The thickness of the platform part may prop the spring up the gingivafor avoiding any irritation. By screwing the screw-body part into themaxilla (or mandible) to make the platform part be abutted against themaxilla (or mandible), not only may it provide a stable screwing forceto make the screw uneasy to loosen, but also may the side surface of theplatform have a function for guiding the gingiva's tissue to grow, sothe wound will be more beautiful after being healed over. Preferably,the head part of the screw according to the invention is furtherarranged with slot for accommodating the orthodontic archwire, so thescrew device according to the invention also has the function forsupporting the orthodontic archwire in similarity to the orthodonticbracket in addition to provide the hooking and hanging function for thespring.

[0015] For further understanding the objects, the characteristics, andthe functions of the structures of the present invention, a detaileddescription matched with corresponding drawings are presented asfollows.

BRIEF DESCRIPTION OF THE DRAWINGS

[0016]FIG. 1 is an embodiment illustration for a screw device, accordingto the prior arts, arranged in the mouth for orthodontic treatment.

[0017]FIG. 2 is a front view for a screw according to the prior arts fororthodontic treatment.

[0018]FIG. 3 is an illustration for tying and connecting an additionalligature wire with the spring and the screw according to the prior artsfor orthodontic treatment.

[0019]FIG. 4A, 4B, and 4C are respectively a front view, top view, andA-A sectional view for the first preferred embodiment for the screwdevice according to the invention for orthodontic treatment.

[0020]FIG. 5 is an illustration for a preferred embodiment for the screwdevice according to the invention for orthodontic treatment in matchingwith the spring and the orthodontic archwire, both which are arranged onthe maxilla (or mandible) for orthodontic treatment.

[0021]FIG. 6A, 6B, and 6C are respectively a front view, B-B sectionalview, and top view for a preferred embodiment for the screw deviceaccording to the invention for orthodontic treatment in matching with ascrewdriver.

[0022]FIG. 7 is the second preferred embodiment for the screw deviceaccording to the invention for orthodontic treatment.

[0023]FIG. 8A is the third preferred embodiment for the screw deviceaccording to the invention for orthodontic treatment.

[0024]FIG. 8B is the forth preferred embodiment for the screw deviceaccording to the invention for orthodontic treatment.

[0025]FIG. 9A is the fifth preferred embodiment for the screw deviceaccording to the invention for orthodontic treatment.

[0026]FIG. 9B is the sixth preferred embodiment for the screw deviceaccording to the invention for orthodontic treatment.

[0027]FIG. 9C is the seventh preferred embodiment for the screw deviceaccording to the invention for orthodontic treatment.

[0028]FIG. 10 is the tenth preferred embodiment for the screw deviceaccording to the invention for orthodontic treatment.

[0029]FIG. 11 is the eleventh preferred embodiment for the screw deviceaccording to the invention for orthodontic treatment.

[0030]FIG. 12 is the twelfth preferred embodiment for the screw deviceaccording to the invention for orthodontic treatment.

[0031]FIG. 13 is the thirteenth preferred embodiment for the screwdevice according to the invention for orthodontic treatment.

DETAILED DESCRIPTION OF THE INVENTION

[0032] One characteristic of the screw device for orthodontic treatmentaccording to the invention is to additionally arrange a platform partthat has a relatively large dimension in radial width between thescrew-body part and the head part of the screw and a neck part is alsoformed between the platform part and the head part. The radial width ofthe neck part is smaller than the head part, which is further smallerthan the inner diameter of the hook ring of the spring. Therefore, thehook ring of the spring may be fitted directly into the head part and bepositioned at the neck part without worrying about being loosened off.The thickness of the platform part may prop the spring up the gingivafor avoiding any gingival irritation. By screwing the screw-body partinto the maxilla (or mandible) to make the platform part be abuttedagainst the maxilla (or mandible), not only may it provide a stablescrewing force to make the screw uneasy to loosen, but also may the sidesurface of the platform have a function for guiding the gingiva tissueto grow, so the wound will be more beautiful after being healed over.Preferably, the head part of the screw according to the invention isfurther arranged with slot for accommodating the orthodontic archwire,so the screw device according to the invention also has the function forsupporting the orthodontic archwire in similarity to the orthodonticbracket in addition to provide the hooking and hanging function for thespring.

[0033] The elements described thereinafter, such as: maxilla (ormandible) 10, gingiva 11, tooth 12, orthodontic archwire 13, orthodonticbracket 14, and spring 15 (or rubber band) for orthodontic treatmentetc., and their relative position arranged in the-mouth are all similarto the prior arts shown in FIG. 1 and they are not the technicalcharacteristic of the invention, so they will be given same elementnames and referential numbers and their detailed composition,arrangement position, and function are not described hereinrepetitiously. One thing is worth mentioning: although the embodiment ofthe prior arts shown in FIG. 1 only depicts an embodiment that acorrection device is arranged on the outside of the upper jaw, however,it may also be arranged on the outside or inside surface of maxilla (ormandible).

[0034] Please refer to FIG. 4A to FIG. 4C, which are respectively afront view, top view, and A-A sectional view for a preferred embodimentfor the screw device for orthodontic treatment according to theinvention. FIG. 5 is an illustration for a preferred embodiment for thescrew device 30 for orthodontic treatment according to the invention inmatching with the spring 15 and the orthodontic archwire 13, both whichare arranged on the maxilla (or mandible) 10 for orthodontic treatment.

[0035] As shown in FIG. 4A, FIG. 4B, FIG. 4C, and FIG. 5, in thepreferred embodiment of the invention, the screw 30 for orthodontictreatment is integrally comprised of a screw-body part 31 of pillarshape, a head part 32, and a platform part 33. The materials of thescrew 30 according to the invention may be titanium alloy or stainlesssteel or other rigid materials that are harmless to human body. Thescrew may be manufactured by a method of integral formation, or only thescrew-body part 31 and the platform part 33 are manufactured integrallyfirst, then the head part 32 is manufactured separately, and the headpart 32 is then welded or glued onto the platform 33.

[0036] The screw-body part 31 is located at one side of the screw 31.The screw-body part 31 of pillar shape is extended an appropriate lengthalong an axis and has a first diameter in the radial direction. On thescrew-body part 31, there is screw tooth arranged for being screwed intothe maxilla (or mandible) 10. The head part 32 is located at anotherside of the screw 30 corresponding to the screw-body part 31. The headpart 32 has a first width in the said radial direction. The first widthis usually smaller than the inner diameter of the hook ring 151 of thespring 15 for providing the hook ring 151 to be fitted directly into thehead part 32 of the screw 30. In a preferred embodiment, the head part32 may be designed in similarity to the prior orthodontic bracket 14 tohave a structure of slot 321 extending ill radial direction. The widthand the depth included in the dimension of the slot 321 are preferablyslightly larger than the diameter of the orthodontic archwire 13.General speaking, there are two kinds of dimension for the slot 141 ofthe prior current orthodontic bracket 14 and the slot 321 of the screw30 of the invention: one is that the width and the depth are 0.022 inchand 0.028 inch respectively, and the other combination is 0.018 inch and0.025 inch. Accommodating the orthodontic archwire 13 into the slot 321of the head part 32 of the screw 30 will make the screw 30 of theinvention provide a function similar to that of the prior orthodonticbracket 14 (as shown in FIG. 5).

[0037] The platform part 33 is connected between the screw-body part 31and the head part 32, and the platform part 33 has an appropriatethickness in the axial direction and has a second width in the radialdirection. Preferably, the second width is larger relatively. That is,the second width of the platform 33 is larger than the first width ofthe head part 32, the first diameter of the screw-body part 31, and theinner diameter of the hook ring of the spring 15. A neck part 322 isalso formed at the connection place of the head part 32 and the platformpart 33. At least one radial width of the neck part 322 is smaller thanthe first width of the head part 32 to make the neck part 322 become apart with narrowest width at a location relatively between the head part32 and the platform part 33. The hook ring 151 of the spring 15 may bedirectly fitted into the head part 32, and be hooked and secured at theposition of the neck part 322. One end of the spring 15 is connected toand secured on the screw 30 device. The thickness of the platform part33 may keep the spring 15 from being abutted against the screw-body part31.

[0038] Two side planes, of the platform part 33, adjacent to thescrew-body part 31 and the head part 32 in the axial direction, are theplanes that each has relatively larger area. Thereby, since the sideplane, adjacent to the neck part 322, is wider than the diameter of thehook ring 151 of the spring 15, so it will become a working platform forfacilitating a doctor in the operation of hooking and hanging the spring15. Not only is the operation very easy, but also may the spring 15 bedirectly fitted, hooked, and hanged at the neck part 322 of the screw 30completely without any worry of being dropped off, so it is absolutelyunnecessary to apply additional ligature wire for tying the spring 15.Relatively, the side plane, at the outer contour of the platform part33, having relatively larger area and smooth surface, will be beneficialin guiding the tissue of the gingiva 11 to grow during the healing overprocedure of the wounds after operation, such that the surface of thegingiva 11 after being healing over is more even and beautiful.Furthermore, when the screw-body part 31 of the screw 31 of theinvention is almost completely screwed into the maxilla (or mandible)10, the lower side surface, of the platform part 33, at the adjacency ofthe screw-body part 31, will be approximately abutted against thesurface of the maxilla (or mandible) 10. At this time, the platform part33, of relatively larger area, will be able to keep the screw 30 fromincurring loose phenomenon because of being forced. Of course, we mayalso choose that the screw-body part 31 is not completely screwed intothe maxilla (or mandible) 10 and a gap is still left.

[0039] In this preferred embodiment, at least one penetration hole 323of axial direction may further be arranged in the neck part 322 at thejointed place of the head part 32 and the platform part 33. The innerdiameter of the penetration hole 323 may be larger than the diameter ofthe wire loop of the spring 15 or larger than the diameter of theorthodontic archwire 13. In another embodiment not shown in the figure,the wire of the end of the spring 15 (or the end of the orthodonticarchwire 13) may be directly fitted into the penetration hole 323 of theneck part 322 and wound around the outer contour of the neck part 322,such that an objective for securing and positioning the end of thespring 15 (or the end of the orthodontic archwire 13) to the screw 30 isachieved.

[0040] In this preferred embodiment, since the head part 32 of the screw30 is designed as a slot 321 structure similar to the orthodonticbracket 14 capable of accommodating the orthodontic archwire 13, so acommon screwdriver is inappropriate for screwing the screw 30 of theinvention into the maxilla (or mandible) 10. If a common traditionalscrewdriver is used directly for screwing the screw 30 of the invention,then it is easy to deform or wear out the slot 321 on the head part 32,such that the slot 321 is no more appropriate for accommodating theorthodontic archwire 13. Therefore, the invention designs the outercontour in the radial direction of the platform 33 as a polygon contour331 of a noncircular shape, such as the contour structure similar to asquare and shown in FIG. 4B and FIG. 4C. This structure may be matchedwith an external screwdriver 40 specially designed for the screw 30 ofthe invention.

[0041] Please refer to FIG. 6A, 6B, and 6C, which are respectively afront view, B-B sectional view, and top view for a preferred embodimentfor the screw 30 device for orthodontic treatment according to theinvention in matching with a screwdriver 40. The screwdriver 40 has ahandle part 41 available for the user to grip, a rotation rod 42extended out an appropriate distance from one side of the handle part41, and a polygon recession seat 43 indented inwardly and arranged tothe end of the rotation rod 42. The shape and the contour of the polygonrecession seat 43 is just corresponded to and matched with the outercontour of the polygon contour 331 of the platform part 33. Therecession depth and the shape of the polygon recession seat 43 may atleast accommodate the head part 32 to make the polygon recession seat 43inset onto the platform part 33. Gripping and rotating the handle part41 may screw the screw 30 into or off the maxilla (or mandible) 10.

[0042] Please refer to FIG. 7, which is another preferred embodiment forthe screw 30 a device according to the invention for orthodontictreatment. In this preferred embodiment, most elements of the screw 30 aare same as those shown in FIG. 4A, so a repetitious description is notpresented herein any more. The only different point is that the platformpart 33 a of the screw embodiment shown in FIG. 7 has a relativelythinner thickness for being adapted to different requirement, forexample, when the mouth's mucous membrane of the patient to be correctedis thinner.

[0043] Please refer to FIG. 8A, which is a further preferred embodimentfor the screw 30 b device according to the invention for orthodontictreatment. In this preferred embodiment, most elements of the screw 30 bare same as those of the embodiment shown in FIG. 4A. The screw 30 balso has a screw-body part 31 b, a platform part 33 b, a head part 35,and a neck part 351. The different point of the screw 30 b shown in FIG.8A is that, in this embodiment, instead of showing a slot as aorthodontic bracket structure, the head part 35 of the screw 30 b isdesigned extensively as a hook-shaped structure. In this embodiment, thehead part 35 is wound by a wire to be shown as an arc shape forconstituting the hook-shaped structure, and the arc-shaped wire is woundapproximately to 180 degree to 300 degree for leaving a gap 352 forproviding the hook ring 151 of the spring 15 to be fitted in. When thehook ring 151 of the spring 15 is hooked directly with the head part 35,the hook-shaped structure may keep the spring 15 from being dropped off.

[0044] Please refer to FIG. 8B, which is a further preferred embodimentfor the screw 30 c device according to the invention for orthodontictreatment. In this preferred embodiment, most elements of the screw 30 care same as those of the embodiment shown in FIG. 8A, so a repetitiousdescription is skipped herein. The only one different point is that thehead part 35 c of the screw 30 c shown in FIG. 8B is formed as aswirl-shaped structure by all arc-shaped wire wound at least 360degrees, so it has better functions for the hook ring 151 of the spring15 to be positioned and secured, no matter with which angle the springis connected to the head part 35 c of this screw 30 c, it still can bekept from loosening off.

[0045] Please refer to FIG. 9A, which illustrates the fifth preferredembodiment for the screw device according to the invention fororthodontic treatment. In this preferred embodiment, most elements ofthe screw 30 d are same as those of the embodiment shown in FIG. 8A, soa repetitious description is skipped herein. The only one differentpoint is that the head part 35 d of the screw 30 d shown in FIG. 9A isformed as a reversed L-shaped structure by a wire bent at 90 degrees, soit has the benefit of being simple structure and easy to bemanufactured.

[0046]FIG. 9B is the sixth preferred embodiment for the screw deviceaccording to the invention for orthodontic treatment. In this preferredembodiment, most elements of the screw 30 e are same as those of theembodiment shown in FIG. 9A, so a repetitious description is skippedherein. The only one different point is that the platform part 33 e ofthe screw 30 e is narrower than which of the screw 30 d shown in FIG.9A. Moreover, the leading end 353 of the head part 35 is extending outof the outer contour of the narrowed platform part 33 e.

[0047]FIG. 9C is the seventh preferred embodiment for the screw deviceaccording to the invention for orthodontic treatment. In this preferredembodiment, most elements of the screw 30 f are same as those of theembodiment shown in FIG. 9B, so a repetitious description is skippedherein. The only one different point is that the head part 35 f of thescrew 30 f is straight rod 355 having a ball head 354 located at the topend of the head part. The ball head 354 has a diameter larger than whichof the rod 355 of the head part 35 f so as to substantially make the rod355 to be the neck part of the screw 30 f.

[0048]FIG. 10 is the tenth preferred embodiment for the screw deviceaccording to the invention for orthodontic treatment. In this preferredembodiment, most elements of the screw 30 g are same as those of theembodiment shown in FIG. 9C, so a repetitious description is skippedherein. The only one different point is that the contour of the platformpart 33 g of the screw 30 g is a polygon contour 331 g having a bindingarea 332 formed at a side portion of the polygon contour 331 g of theplatform part 33 g. The binding area 332 has an area relatively biggerthan other side parts of the polygon contour 331 g and can be attachedwith an additional component (not shown in this figure) choosing by theoperator (doctor) for assisting orthodontic treatment.

[0049]FIG. 11 is the eleventh preferred embodiment for the screw deviceaccording to the invention for orthodontic treatment. In this preferredembodiment, most elements of the screw 30 h are same as those of theembodiment shown in FIG. 10, so a repetitious description is skippedherein. The only one different point is that the binding area 332 h ofthe platform part 33 h of the screw 30 h is attached with an orthodonticbracket 334 which is similar to the prior-art orthodontic bracket 14shown in FIG. 1.

[0050]FIG. 12 is the twelfth preferred embodiment for the screw deviceaccording to the invention for orthodontic treatment. In this preferredembodiment, most elements of the screw 30 i are same as those of theembodiment shown in FIG. 11, so a repetitious description is skippedherein. The only one different point is that the binding area 332 i ofthe screw 30 i is attached with a component 335 which has an elongatedslot 3351 formed adjacent to the binding area 332 i. Therefore, theelongated slot 3351 substantially forms a through hole for allowing theorthodontic archwire to pass through. In addition, the head part 35 i ofthe screw 30 i shown in FIG. 12 is a reversed L-shaped structure whichis similar to the one shown in FIGS. 9A and 9B.

[0051]FIG. 13 is the thirteenth preferred embodiment for the screwdevice according to the invention for orthodontic treatment. In thispreferred embodiment, most elements of the screw 30 j are same as thoseof the embodiment shown in FIG. 11, so a repetitious description isskipped herein. The only one different point is that the binding area332 j of the screw 30 j is attached with a component 336 which has anelongated slot 3361 formed on a surface away from to the binding area332 j. The cut section view of the slot 3361 is a circle having adiameter similar of slightly larger than which of the orthodonticarchwire (not shown in this figure). Therefore, the elongated slot 3361can allow the orthodontic archwire to pass therethrough. However, it isnoted that the cut section view of the slot 3361 can also be arectangular shape as which shown in FIG. 12.

[0052] Summarizing above description, the screw device according to theinvention for orthodontic treatment indeed has following advantages:

[0053] (1) It is easy to operate. The head part and the neck part of thescrew device according to the invention may be provided for hooking andhanging the spring directly without any worry of loosening off, andadditional ligature wire is further unneeded for tying the spring.

[0054] (2) The spring won't make any irritation to the gingiva. Theplatform part of the screw device according to the invention has anadvantage to prop the spring up the gingiva with an appropriate heightto avoid any irritation.

[0055] (3) It is uneasy for the screw to loosen. The screw-body part ofthe screw of the invention may be completely screwed into the maxilla(or mandible) for keeping from loosening.

[0056] (4) The gingiva will be more beautiful after being healed over.The relatively larger area of the side surface of the outer contour ofthe platform part may provide a smooth surface for guiding the gingivatissue to grow for making the surface of the gum be more beautiful afterbeing healed over.

[0057] (5) It also has the function of orthodontic bracket. Slot isfurther formed at the head part of the screw of the invention foraccommodating the orthodontic archwire to make the screw device of theinvention further have the function similar to a orthodontic bracketcapable of supporting the orthodontic archwire, aside from the functionfor hooking and hanging the spring.

[0058] Although the present invention has been described with referenceto a preferred embodiment, it should be appreciated that variousmodifications and adaptations can be made without departing from thescope of the invention as defined in the claims.

What is claimed is:
 1. A screw device for orthodontic treatment capableto be used with a spring used for orthodontic treatment, comprising: ascrew-body part extending an appropriate length along an axis and havinga first diameter in the radial direction; a head part, which has a firstwidth in the radial direction; and a platform part, which is connectedbetween the screw-body part and the head part, and which has anappropriate thickness in the axial direction and also has a second widthin the radial direction, and the second width is larger than the firstwidth, a neck part being formed between the head part and the platformpart, said spring being capable to be hooked directly on the neck partof the screw device, such that one end of the spring is connected andsecured on the screw device, in addition, the thickness of the platformpart may keep the spring from being abutting toward the screw-body part.2. The screw device for orthodontic treatment according to claim 1,wherein the head part is formed as a reversed L-shaped structure by awire bent at 90 degrees such that a spring can be hooked directly withthe head part.
 3. The screw device for orthodontic treatment accordingto claim 1, wherein the outer contour of the platform part in the radialdirection is a polygon contour.
 4. The screw device for orthodontictreatment according to claim 3, wherein the screw device further has abinding area formed at a side portion of the polygon contour of theplatform part, the binding area can be attached with an additionalcomponent for assisting orthodontic treatment.
 5. The screw device fororthodontic treatment according to claim 4, wherein the componentattached on the binding area is an orthodontic bracket.
 6. The screwdevice for orthodontic treatment according to claim 4, wherein thecomponent attached on the binding area has an elongated slot formedadjacent to the binding area so as to substantially form a through holefor allowing an orthodontic archwire to pass through.
 7. The screwdevice for orthodontic treatment according to claim 4, wherein thecomponent attached on the binding area has an elongated slot formed on asurface away from to the binding area.
 8. The screw device fororthodontic treatment according to claim 7, wherein a cut section viewof the elongated slot is a circle having a diameter similar of slightlylarger than which of an orthodontic archwire.
 9. A screw device assemblyfor orthodontic treatment, comprising: a orthodontic archwire fororthodontic treatment; at least one orthodontic bracket, which may beconnected and secured on a tooth, and top part of which is arranged withslot available for accommodating the orthodontic archwire to furtherprovide a support function for the orthodontic archwire; at least onespring, one end of which is connected to one end of the orthodonticarchwire, and which may provide a pull force to the orthodonticarchwire; and a screw device, which is located at a position with anappropriate distance away from the orthodontic archwire, and which isfurther comprised of: a screw-body part, extending an appropriate lengthalong an axial direction and having a first diameter in the radialdirection; a head part, which has a first width in the radial direction;and a platform part, which is connected between the screw-body part andthe head part, and which has an appropriate thickness in the axialdirection and also has a second width in the radial direction, and thesecond width is larger than the first width, such that a neck part isformed at the place where the head part and the platform part arejointed, and the neck part being available for the other end of thespring to be connected directly.
 10. The screw device assembly of claim9, wherein the head part is formed as a reversed L-shaped structure by awire bent at 90 degrees such that a spring can be hooked directly withthe head part.
 11. The screw device assembly of claim 9, wherein theouter contour of the platform part in the radial direction is a polygoncontour.
 12. The screw device assembly of claim 11, wherein the screwdevice further has a binding area formed at a side portion of thepolygon contour of the platform part, the binding area can be attachedwith an additional component for assisting orthodontic treatment. 13.The screw device assembly of claim 12, wherein the component attached onthe binding area is an orthodontic bracket.
 14. The screw deviceassembly of claim 12, wherein the component attached on the binding areahas an elongated slot formed adjacent to the binding area so as tosubstantially form a through hole for allowing an orthodontic archwireto pass through.
 15. The screw device assembly of claim 12, wherein thecomponent attached on the binding area has an elongated slot formed on asurface away from to the binding area.
 16. The screw device assembly ofclaim 15, wherein a cut section view of the elongated slot is a circlehaving a diameter similar of slightly larger than which of anorthodontic archwire.